Multicolor prints by diffusion transfer processes employing screened elements



Feb. 12, 1963 E. LAND 3 077 399 Mll lggggg pgmgs gy ISDIFFUSION TRANSFER PL Y c; CREENED ELEME Filed Sept. 25. 1957 MS 5 Sheets-Sheet 1 Diffusible Image-Forming Componenl's Represen'l-ing Cool Colors Unused Areas {Diffusible Dye angl Imoge- Forming Componen'ls Represen'l-ing Worm Colors Whil'e Densllies Represenlin'g Worm Colors {Diffused Dye and Block-and- 2 26b L alock-and whil'e Densifies Mo 5 Represenl'ing Cool Colors Blqck-und-Whi'le Densil'ies Represenfing Cool Colors Dye and Black-ind-Whfie Densi'lies Represen'l'ing Warm Colors 5M MW??- ATTORNEYS e MULTICOLOR PRIN'I fix msron TRANSFER 3077399 PROCESSES EMPLOYING SCREENED ELEMENTS Flled Sept. 25, 1957 5 Sheets-Sheet 2 Diffusible Imu -Forming Componenl's 34a-\ Represenl'ing C Colors 32 3O 34 1 3s Unused Area 3| Diffusible Dye and Image- 5x23 Ar Forming Componen'ls 38 a 7) p e ea Represenfing Warm Colors l 40 R\ 440 -38a FIG. 4

WhH-e Densi'l'ies Represen'l'ing Warm Colors {Diffused Dye and Block-cand- Block-ond-While Densil'ies Represenl'ing Cool Colors FIG. 5

Block-or|d-Whi+e Densi'l'ies Represen-Hng Cool Colors Densil'ies Represenl'ing Dye and Block-and Whi'l'e Worm Colors INVENTOR. 5M 2/ (M BY ATTORNEYS Feb. 12, 1963 E LAND 3,077,399

PRILNT BY DIFFUSION TRANSFER E E EMF OYING SCREENED ELEMENTS Flled Sept. 25, 1957- 5 Sheets-Sheet a Diffusible Image-Forming Componenfs Represenfing Worm Colors Componenl's Represen'l'lng {Diffusible Imoge- Forming Cool Colors Green sr-q Exposure Area Red 62 64 Green 56w 52 58K; Red

74 54 W;{ii-mHawaii's.:w'zflmm; Diffused Dens i'l'ies Represen'l'ing l 66 {Cool Colors Diffused Densi'lies Represenling F'lG 8 Warm Colors Block-ond-Whl'l'e Densllies Represen'l'ing Cool Colors Red Block-ond-whil'e Densil'ies X M Represenl'ing Warm Colors 68 l| I \I '1 '68 L 6801 INVENTOR.

FIG. 9

ATTORNEYS Feb 12 1963 E. LAND 3 077 399 sags-$12; 555555125 CREENED ELEME T I Flled Sept. 25. 1957 k S SheetS-Sheet 4 g Diffusible Red Dye and Diffusible Image- Form ing Componenl's Represenl'ing Worm Colors Non-Diffusible Green Dye and Diffusible Image Forming Componenl's Represenling Cool Colors 82 Green 78 84 Uncolored 96 Diffused Red Dye 8O BIack-oncl-Whi'l'e DensH'ies Represenl'ing Cool Colors 92a Block-and Wh|+e Densrhes 94b 94a Represen'l'ing Worm Colors FlG. l l

Uncolored 92b Red 92 {Black-and-Whil'e Densil'ies r' INI 1 Represenfing Cool Colors 90 l k Blqck-and-While Densi'l'ies L W Represen'l'ing Warm Colors 94 94b INVENTOR.

ATTORNEYS Feb 12 1963 E. LAND 3 077 399 MULTICOLOR PRINTS BY DIFFUSION TRANSFER PROCESSES EMPLOYING SCREENED ELEMENTS Flled Sept. 25, 195'? 5 Sheets-Sheet 5 H4 6 Exposure Area I A w (lose l Red Screen Sec'l'ion I06 Uncolored Screen Secl'ion Componenl's Represenl'ing Cool Colors xUncolored Emulsion Porlion Conl'aining Diffusible Image-Forming Componen'ls FIG. l3

Represenl'ing Warm Colors lOBb lOBa {Block-and-Whire Densil'ies '06 |O6a H6 3 SU Represen'ling Warm Colors XV y Black-and-Whi'l'e Densiries I08 inywu Represen'l'ing Cool Colors "2 Red Screen Secl'ion Uncolored Screen Sec'l'ion l 2 4 Green Emulsion Por+ion I28 FIG. l4

INVENTOR.

ATTORNEYS nite Fateraterl Feb. l2, 19553 S- 25, 1957, her. No. 636,219

16 (Clo 96-33) This invention relates LO the formation of photographic prints embodying only a single color medium but which have the appearance of multicolor prints and, more particularly, to the formation of photographic prints of the character described by a novel screen process.

This application is a continuation-in-part of my cpending application, Serial No. 468,251, filed November 12, 1954, which latter application is, in turn, a continuation-in-part of application Serial No. 415,510, filed March 11, 1954, both cases now abandoned.

it is known that when two photographic exposures of a given subject are taken through red and green filters and when one of the resulting prints is propected through a filter of one of these colors while the other print is projected in white light, an image is produced which appears to be multicolored. The phenomenon is not understood although it has variously been attributed as due to the fact that complementary colors can be evoked by mere contrast, by retinal fatigue, by a combination of the two or by some other psychological process. More specifically, the formation of multicolored images in this manner ms in the past been associated with the motion picture field wherein a special type of camera having a beam divider, two taking lenses and two color filters is used to provide blaclt-and-white pictures representing separate colors of the photographic subject, the pictures being in the form of a pair of prints arranged side-byside in each frame of film. A projection system embodying two projection lenses and but one color filter is then employed to provide a projected image of the photographic subject which appears multicolored. While apparently embodying the virtue of simplification by us ing but a single color-providing element in the projection system to provide an effect somewhat comparable to that obtained by a twoor three-color process, the foregoing method will be seen to involve a considerable and necessarily expensive modification of both camera and projection apparatus and to require the accurate registration of images A ejected along separate and convergmg optical axes. Moreover, the aforesaid method is not adapted to the production of either a transparency or a reflection print for direct viewing which, of itself, is capable of producing a multicolored effect.

The present invention contemplates employing all of the advantages accruing to the use of a single color medium to provide a multicolored image effect for projection purposes while requiring substantially none of the aforesaid elaborate modifications of the camera and projector optical system Moreover, the present invention is adapted to the synthesis of image portions or increments to provide in colored appearing transparencies and reflection prints for direct viewing as Well as for projection, to the formation of ti several types of print by a diffusion transfer reversal method. A diffusion transfer reversal method which may be considered as somewhat related to the method disclosed herein is contained in United States Patent No. 2,767,150, issued in the name of Edwin H. Land on April 26, 1955. The present invention, however, involves photosensitive components, screen elements, a relative arrangement of screen and image components, and diffusion transfer operations rid differing in various significant respects from those shown in the aforesaid patent.

in accordance with the aforesaid considerations, an object of ti e present invention is provide a photographic print of a simple, though novel screen type embodying but a single color which, of itself, is capable of provida multicolor effect, and which is adapted to use as a transparency for direct viewing or for projection in a conventional projector or, when including a reflection backing, as a reflection print without the addition of special filters, lenses, light sources and the like.

Other objects are to provide a print or" the character described by a difiusion transfer reversal method inv0lvthe provision of a novel composite film unit or assembly which is especially adapted to such a method; to provide a print of the character described in which the color medium employed is of a red or reddish hue; to provide a print of the character described wherein the screen is in the form of a geometric pattern composed, for example, of interspersed red and white lines with the area of the red lines exceeding that of the white lines to an extent resulting in a balance of luminosities between the colored and uncolored portions, or wherein the screen is in the form of an irregular mosaic; and to provide through a screen film process a self-sufficient type of print wherein there is a reduced absorption and hence an improved transmission of light in comparison with prints produced by conventional twoor three-color screen plate methods.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the several steps and the relation and order of one or more of such steps with respect to each of the others, and the product possessing the features, properties and the relation of elements which are exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings wherein:

FIGURE 1 is a diagrammatic, fragmentary view, partly in cross-section, illustrating photographic means for performing the process of the present invention, the film layers and emulsions shown being greatly exaggerated in thickness;

PEG. 2 is a diagrammatic, fragmentary view, partly in cross-section, further illustrating the process exemplified in FIG. 1;

FIG. 3 a fragmentary view in perspective of a photographic print produced by a process of the invention;

FIG. 4- is a diagrammatic, fragmentary view, partly in s'saction, further illustrating the process of the present is a dia rammatic, fragmentary view, partly in section, further illustrating the process exemplified v3 cross-section, further illustrating the process of the present invention;

H6. 11 is a diagrammatic, fragmentary view, partly in cross-section, further illustrating the process exemplified in FIG.

FIG. 12 is a fragmentary view in perspective of a photo-- graphic unit produced by a process such as that exemplitied in FIGS. 10 and 11;

FIG. 13 is a diagrammatic, fragmentary view, partly in cross-section, additionally illustrating the process of the present invention; and

FIG. 14 further illustrates the photographic assembly of HS. 13 undergoing a process of the present invention.

Referring to KG. 1, there are illustrated two longitu-- dinal fragmentary sections of sheetlike materials of the invention, namely a film element 12 and a print-receiving sheet element 14 which may be considered as positioned in a processing chamber of a suitable camera (not shown) and which, either originally or when brought together and compressed by compression means of the camera, form an: assembly adapted to a novel difiusion transfer reversal process. The process is one for producing a print embodying only a single color medium but which presents the appearance of a multicolor print comprising a reason-- ably faithful record of the colors of the photographicsubject when viewed in either transmitted or reflected light. A collapsible or rupturable container 16 releasably enclosing a processing liquid or reagent 1% is attached to sheet element 114. Film element 32 and sheet element 14 rnay be provided separately or as a composite assembly as, for example, in the form of a continuous strip with the elements 12 and 14 joined together at given sections toinsure proper registration of their parts during exposure and processing. Alternatively, they may be supplied asv elements of a cut-film type of unit.

Film element 12, which may be assumed to have previously undergone a photographic exposure in the direction indicated by the arrow 13 and then to have been metered to the facing position shown with respect to sheet. 14, includes a base 2 an orthochromatic silver halide gelatin emulsion layer 22 and a plurality of screen configurations 24 of a red-sensitive emulsion, for example, a. panchromatic silver halide gelatin emulsion overlaid on the orthochromatic emulsion 22. in the preferred embodiment shown, it will be noted that the interspersed configurations 24 are in the form of stripes and are of a greater width than the interstices or interspersed stripes 22a ofthe orthochromatic emulsion. As shown, the stripes 22a and 24 are greatly exaggerated in size and thickness and. may include several hundred to the inch in accordance with the usual dimensions of geometric screens. From 100 to 250 or more stripes to the inch have been used satisfactorily. Stripes 24 are dyed with a dye, represented in the illustration by shading, which is difiusible with. respect to the processing liquid and which, in a preferred example, is of a red or generally reddish color and is thus. adapted to transmit the red, yellow and orange colors, namely, the warm colors of the subject of a photographic exposure. Accordingly, the red-dyed panchromatic emulsion stripes 24 are substantially limited to exposure by light rays of these colors from the subject. The orthochrornatic emulsion layer 22 is undyed and the interstices or stripes 22a of said layer are thus adapted to be exposed by the green, blue and violet colors, namely, the cool colors of the subject. The terminology warm colors and cool colors to designate colors of the spectrum is conventional in the photographic art and is employed herein in the senseusually attributed thereto. If desired, the orthochromatic layer may have an overlying yellow filter stratum to restrict its sensitivity to green, or a yellow filter may be used with the camera. The stripes 24 of panchromatic silver halide gelatin emulsion can be formed on orthochromatic emulsion layer 22 by any suitable method, in the absence of actinic light, as, for example, by a rotogravure, letter press, oiiset, silk screen, or embossing technique, or by procedures involving the use of a spray or a serrated doctor blade. A dye mordant may be included in the emulsion of stripes 24 as, for example, to the dye to a desir d degree and to substantially prevent its encroachment through lateral diffusion into the clear stripes 22a during formation of the composite emulsion structure. Should slight lateral diffusion of the red dye occur during preparation of the emulsions, it is held by the mordant to an insignificant value when compared to the total area of the red-dyed stripes.

As previously noted, it is to be assumed in FIG. 1 that the undyed orthochromatic and dyed panchromatic screen stripes 22a and of film 12 have previously been photographically exposed. The dotted portions of the emulsion stripes represent the unexposed and partially exposed silver halide which is present in addition to the exposed silver halide forming the latent negative image. The unexposed and partially exposed silver halide constitute potentially diffusible positive image-forming components adapted to be reacted with the processing liquid 18, as will be described below more particularly with respect to H6. 2.

The print-receiving sheet element 14 is formed of any suitable material such, for example, as a transparent film or an opaque paper of one or more layers, depending upon Whether the printed image is to be formed directly thereon or on a specially prepared surface, or whether the image is to be viewed in the form of a transparency or as a reflection print. Container 16, attached to the surface of sheet 14 which faces film 12, extends transversely across the sheet immediately to one side of the area of the sheet which is to carry the print, namely, that area-which is registered with the area of photographic exposure of the film.

in the step illustrated in FIG. 1, it is to be assumed that the film and sheet elements are about to be moved in a direction toward the left between a pair of pressureapplying members such as a pair of pressure rollers (not shown), in response to which the sealed edges lea of the container are forced apart and the processing liquid 13 is spread in a uniformly thin layer between the surfaces of the stripes of the respective emulsions which face the surface of sheet 14.

The diffusion transfer, image-forming steps occurring after spreading of the processing liquid are generally as follows. The processing liquid, comprising a silver halide developer such as hydroquinone and a silver halide solvent such as sodium thiosulfate in an aqueous alkaline solution, is imbibed into the film emulsion, reduces exposed silver haiide forming the latent negative image to silver and reacts with unreduced silver halide to form a diffusible, water-soluble complex silver salt. To effect a satisfactory transfer or diilusion of image-forming components and formation of a print of acceptable quality, the emulsion and image-receiving surfaces are maintained in superposed contiguous relation for a given period, preferably from 48 to 126 seconds in duration, during which exposed silver halide is reduced to silver and unreduced silver halide forms the aforesaid complex silver salt which diffuses to an image-receiving surface where it is reduced to silver in the form of a black-and-white print. At the end of this period, the film unit comprising base 29 and emulsion layers 22 and 24 is stripped from the imagereceiving surface. Alternatively, the developing agent may be contained in a layer of the film element and released when permeated by the processing liquid. Materials useful in a transfer process of the type contemplated are described in United States Patent No. 2,543,181, issued in the name of Edwin H. Land on February 27, 1951.

g The processing liquid employed in the foregoing transier step is preferably viscous to facilitate evenness of spreading. Viscositics of from to 208,006 centipoises. at a temperature of 20 C. have been successfully em-- ployed but viscosities approaching the higher value are preferred. The desired viscosity of the processing liquid composition is provided by a thickening or filnnforming agent such as a watcnsoluble synthetic polymer, an insoluble emulsiiiable oil, a starch or a gum. The viscous processing liquid after spreading and hardening to the form of a thin film may be in a condition where it is Jreferentially attached to the print-receiving sheet as an image-carrying and dye-receiving layer thereof. Or, the complex silver salt image-forming components and diffused dye may pass substantially rectilinearly through the processing liquid directly to the image-receiving sheet or to a prepared surface thereof according to the specific method practiced. Accordingly, during stripping of the film element 12 from print-receiving sheet M, the stratum or fdm of hardened processing liquid either remains with the emulsion or, as shown, it adheres to the print-receiving sheet. Methods which enable optional stripping of the character described are taught in United States Patent No. 2,647,056 issued to Edwin H. Land on July 28, 1953. The print-carrying layer, whether formed of the hardened processing composition or in the form of a specially prepared surface of base l4, may also include a dye mordant to facilitate receptivity to and fixing of the diffused dye.

Further referring to F188. 1 and 2, it has been noted that the redclyed panchromatic silver halide gelatin emulsion stripes 24 contain both exposed silver halide constituting a latent negative image and unexposed silver halide image portions or increments representing the warm colors of the subject which are to be diifused in forming the positive print, the potentially difiusible image portions being shown as dotted areas thereof. Similarly, the uncolored interspersed stripes 22a of orthochromatic emulsion layer 22 contain both exposed silver halide and unexposed silve halide image portions or increments, the latter representing the cool colors of the subject, being potentially difiusible, and also being shown as dotted areas. The red dye incorporated in panchromatic emulsion stripes 24 and represented by shading is rendered difiusible when subjected to the processing liquid. in FIG. 2, the film element 12 and sheet element 14 are shown in an integral compressed condition, said elements having passed between the aforesaid pressure-applying rollers. Container 16 has been collapsed in response to the applied compression and processing liquid 18 has been released thererrom between the separable container edges 16a. The silver halide developer and silver halide solvent in aqueous solution the processing liquid have permeated the emulsion stripes 24 and 22a. The film-forming ingredients of the processing li aid have assumed the form of a relatively thin transparent stratum or 'fiirnlilte layer 12.6. The film of hardened processing liquid 26 is shown as preferentially adherin to print-receiving sheet and is employed as the print-carrying layer. As shown in PEG. 2, a substantially rectilinear difiiusion of the complex silver salt and red dye from emulsion stripes to print-carrying layer 26 and reduction of the silver salt to silver have occurred, as represented by the dottedshaded portions Likewise, a substantially rectilinear difiusion of the complex silver salt from emulsion stripes to print-carrying layer 26 and reduction of the silver salt to silver have occurred, as represented by the dottedunshaded portions 265.

Although the dotted silver image portions are shown as distributed to the full depth of layer 26, it should be understood that they may be restricted substantially to the surface thereof. it is particularly to be understood that no significant diffusion of image-forming components which may have been present in the orthochromatic emulsion layer 22 directly behind the overlaid panchromatic stripes 24 occurs. The thickness of the panchromatic gelatin stripes 24 is sufficient to constitute a barrier which prevents any unwanted diffusion of complex silver salt from emulsion layer 22 in the area mentioned and which would cause degradation of the positive print.

FIG. 3 represents a fragmentary portion 28 of the print produced by the method hereinbefore described comprising the base is and print-carrying layer 25 of HS. 2 which have been stripped from the film element 12 and separated from the portion of base 14 to which collapsed container its is attached along partial perforations 14a. Consistent with the aforesaid description of the elements and print-forming steps involved in conjunction with FIGS. 1 and 2, the print assembly of FIG. 3 comprises base 14 which may be either transparent or opaque depending upon whether the print is to be employed as a transparency for direct viewing, as a reflection print, or as a slide for projection, transparent red-dyed stripes 26a containing black-and-white silver image portions constituting a record representing the warm color content of the subject, and transparent uncolored stripes 261) containing black-and-white silver image portions constituting a record representing the cool color content of the subject. Uncolored areas of the photographic subject will, of course, be represented in both the stripes 26a and 26b. The uncolored stripes 2612 are slightly thicker than those of the red-dyed stripes 26a owing to the two planes of the emulsion layers, as shown in FIGS. 1 and 2, and the embossing effect thereof on the viscous processing liquid during compression of the assembly. Actually, however, there would be only a relatively small perceptible difference in the thicknesses of the red-dyed and uncolored stripes, said difference being greatly exaggerated in the illustration. Although containing but a single color medium, namely, the red dye, the print assembly of HG. 3 exhibits the effect of a multicolor print when viewed either in transmitted or reflected light as, for example, when in the form of a transparency for direct viewing, a projection slide, or a reflection print.

Further referring to the print unit of FIG. 3, the relative widths of the red and white stripes 26a and 26b are chosen to provide substantially equal or balanced luminosities of the red and uncolored image portions or increments, due consideration also being given to related factors such as the absorptive properties of the dye, the density characteristics of the image, etc., the condition of equal luminosities generally requiring that the red stripes exceed the white stripes in width. Thus, it has been found that the width of the red stripes may exceed that of the white stripes by from two to five times to provide a satisfactory balance. More specifically, the factors determining the selected widths of the stripes comprise the relative densities of the warm and cool image portions as determined by the photographic exposures, the brilliance or dullness of the dye, the transparency of the dye, and the wavelength characteristics of a light source if the print is used for projection purposes. If the unit is to be used as a reflection print, base ltd may, for example, be a white surfaced paper chosen for its reflectivity or it may consist of an opaque or transparent material having a metallic or other diflusing-refiecting surface.

In reproducing the colors of the subject of a photographic exposure in accordance with the present invention best results are obtained when the warm colors of the subject are reproduced in light of wavelengths above 552 millimicrons and the cool colors are reproduced in light of wavelengths below 552 millimicrons, this value being at the peak of the curve of relative luminosity versus wavelength. Preferably the red dye of the positive print is not identical with the red color content of the subject, the red dye being less orange than said color content. The dyes are preferably chosen for use with substantially white light although light containing an excess of a given wavelength may be employed in the interests of obtaining some accentuated color effect.

FIGS. 4-, 5 and 6 illustrate a diffusion transfer reversal method and means for forming a print of the invention which are generally similar to those described with respect to FIGS. 1, 2 and 3 but wherein the print-carrying layer is in the form of an image-receiving stratum or layer originally forming a part of the print-receiving sheet ind stead of a layer formed of the solidified liquid processing compositions. After exposure of film element 36 in the direction of arrow 31, the assembly is adapted to be compressed in the manner hereinbefore described. Film element 36 comprises base 32, an orthochromatic silver halide gelatin emulsion layer 36 and a plurality of screen configurations of a panchromatic silver halide gelatin emulsion 36 formed as red-dyed stripes on the uncolored orthochromatic emulsion 34. The emulsion elements 34 and 36 may be considered as similar to those previously described relative to PEG. 1, the emulsion 3 4 thus comprising interstices or stripes 34a. Dotted areas of layers 34 and 36 represent potentially difiusible image-forming components and the shading of layer 36 represents ditfusible dye, as described relative to F168. 1 and 2. v

The print-receiving element 38 includes a base 4.6, which is transparent or opaque according to intended use of the print, and a silverand dye-receptive layer or stratum 42. Layer 42 preferably includes at least a substance for enhancing the precipitation of silver and may also include a dye mordant or other substance for facilitating transfer and fixing of the dye which is diffused from stripes 36.

Substances of the type contemplated for incorporation in layer 42 are described in United States Patents Nos. 2,698,237 and 2,698,245, issued on December 28, 1954,

to Edwin H. Land. A collapsible container 54 having separable .edges 44a and containing a processing liquid composition 46 is mounted on the layer $2. In FIG. 5, the diffusion transfer step is illustrated. The ditfusible dye, represented by shading, is shown as having migrated through the spread processing liquid from emulsion stripes 36 to areas 42a of the print-carrying layer. Complex silver salt, represented by dotted areas, is shown as having migrated through the spread processing liquid from both emulsion stripes 36 and 34a to areas 420 and 42b of the print-carrying layer. Accordingly, image portions or increments 42a and 42b of the print are in the form of stripes, portions 42a representing the warm colors of the subject being dyed a reddish color and portions 42b being uncolored. While the dotted silver image areas are shown as having penetrated to the full depth of layer 3-2, they may be restricted to an area adjacent the surface thereof. The hardened layer 45 of film-forming substance contained in the processing liquid is shown as adhering to film element 56 when the film element is stripped from printreceiving element 38. It will be apparent however that layer iS could be retained on surface 42 of element 38, the layer being transparent if the print is to be in the form of a transparency. If the print is to be of a reflection type, assuming base 46 to be transparent, layer 48 could contain a white or a metallic substance adapted to serve as a reflecting surface.

P16. 6 illustrates a fragmentary section 56 of the print after the stripping step shown in FIG. 5, the area 56 having been separated from portions of the print-receiving element 33 to which container t4; remains attached along semi-perforations 33a. The print section 56 comprises base as, red-dyed image-bearing portions 42:: representing the warm colors of the photographic subject and uncolored image-bearing portions 4211 representing the cool colors of the photographic subject. Excepting the raised form of the uncolored stripes, section fill is generally similar to the section 23 of MG. 3, hereinbefore described.

An alternate construction of the film element 12 of FIG. 1 or film element 36 of FIG. 4 would supplant the orthochromatic emulsion with an overall layer of a panchromatic emulsion or an emulsion preferentially sensitized to the warm colors, for example, to red, and a contiguous layer embodying a difiusible red or reddish dye. A plurality of stripes of orthochromatic emulsion would be overlaid on the first-named emulsion layer or on the layer containing the diffusiole dye depending upon which layer occupied the outermostposition. While the additional layer containing the diffusible dye could be dis- 'pensed with and the dye incorporated directly in the layer of red-sensitive emulsion, the use of a separate layer for the purpose is preferred and the location of said layer is preferably innermost or adjacent the film base so that the stripes of orthochromatic emulsion would be formed directly on the layer of red-sensitive emulsion. During the diffusion transfer reversal steps, the dye would then migrate through the layer of red-sensitive emulsion to the print-receiving element excepting in areas upon which are overlaid the additional stripes of orthochromatic emulsion, the latter acting as barriers to such a migration. In accordance with considerations previously discussed relative to FIGS. 1 through 6, the orthochromatic emulsion stripes would be narrower than the intervening bands or stripes from which the red dye is transferred. Accordingly, the print would be formed through the synthesis of interspersed red-dyed and uncolored image-bearing portions or increments in the form of stripes in which the width of the red-dyed stripes exceeds that of the white by a given amount. The foregoing modification would provide a print which is functionally similar to those shown in FIGS. 3 and 6, but wherein the uncolored stripes would be slightly recessed relative to the red-dyed stripes.

In FIG. 7 there is illustrated a modification of the process and product of the invention wherein are shown two fragmentary sections of cooperating sheetlike elements, namely, a film element 52 and a print-receiving element 54 as they might be positioned in the processing chamber (not shown) of a camera of the type previously mentioned comprising suitable compressing means. Film element 52 comprises a base or support 56, a panchromatic silver halide gelatin emulsion 58 and a screen or composite filter 66 formed of red filter sections 62 and green filter sections 64. Filter sections 62 and 64 are in the form of interspersed stripes, it being noted that the width of the red stripes exceeds that of the green. Printreceiving element 54 includes a support or base 66, and a silverand dye-receptive print-carrying layer 68. A collapsible container 70, releasably enclosing a processing liquid 72, is attached to layer 68. The'considerations of mutual attachment or non-attachment of elements 52 and 5d, the form of container 76, and the properties of layer 68 and of processing liquid 72 are generally similar to those described with respect to FIG. 4.

When emulsion 58 is photographically exposed through screen 66 in the direction indicated by the arrow 61, prior to metering of the elements 52 and 54 to the positions shown in FIG. 1, the filter sections 62 and 64 filter the light from the subject according to the distribution of warm and cool colors thereof and latent image portions are either formed in the emulsion or are absent therefrom in accordance with said filtering action in a manner known to the art. When processing liquid 72 is released from container 76 and spread between screen 66 and layer 68, as shown in FIG. 8, the silver halide developer and solvent comprised by the liquid in aqueous alkaline solution permeate screen 66 and emulsion 58. Exposed silver halide of the latent image is reduced to silver and unreduced silver halide identified with the warm and cool colors of the subject and illustrated in FIG. 7 as dotted portions of layer 53 is caused to diffuse substantially rectilinearly to layer 63 in the form of a complex silver salt, as indicated by dotted portions 66a and 63b of layer 68, where it is reduced to silver and represents, in terms of black-and-white densities, the imagewise distribution of said warm and cool color content of the subject. The silver image portions may be formed adjacent to the surface of layer 68 rather than being distributed to the full depth of said layer, as shown. Filter 60 is so constructed that when film element 52 is stripped from print-receiving sheet 54-, green filter sections 64 remain aflixed to emulsion 58 while red filter sections 62 adhere to the layer of hardened processing liquid 74 which constitutes a bonding agent.

FIG. 9 illustrates a fragmentary section 76 of the print which has been separated along semi-perforations 66a accuses from the non-image-carrying area which includes the collapsed liquid container ill. Warm color image portions are optically ali ned with red filter sections 62 and cool color image portions 68b have no filter sections aligned therewith and are therefore uucolored. Base 66 is either transparent or opaque depending upon whether the print is to serve as a transparency or a reflection print. The print up cars multicolored when viewed directly or provides the effect of a multicolored image when employed as a projection slide in a conventional projector.

in FIG. a further modification of the process and product of the invention is illustrated. Fragmentary sections or" a film element 73 and a print-receiving element are shown in facing contiguous relation as they would appear in the processing chamber of a camera (not shown) which includes suitable compression-applying means. The film element 73 comprises a base 312 and a panchromaic silver halide gelatin emulsion S4. The emulsion comprises red-dyed sections as and green-dyed sections 88, said sections being in the form of stripes and the red-dyed stripes exceeding the grccn-dyed stripes in width. The red dye is chosen to be water soluble and the green dye water insoluble.

The print-receiving element 8% includes base 9%, a preferably transparent, water-permeable dye-substantive layer 92 and a silver-receptive print-carrying layer A collapsible container $56 releasably holding an aqueous solution of a processing liquid 98 is attached to layer 98. The aforesaid materials are of types generally similar to those hereinbefore described. Emulsion layer 84 and print-carrying layer 9 may suitably embody a dye mordant for improved control of the dye and imageforming components.

When emulsion 53 iis photographically exposed in the direction indicated by the arrow 85, the red and green dyes of strips sections 85 and 88 filter the light from the subject in accordance with the distribution of warm and cool colors thereof so that latent image portions are formed in the respective stripes. With the release of the processing liquid 95?: from container $6 and its spreading between emulsion layer 84 and dye-substantive layer 92, as shown in EEG. ll, reagents of the liquids, comprising silver halide developer and solvent in an aqueous alkaline solution, permeate the emulsion 84, reduce the exposed silver halide to silver and cause unreduced silver halide, identified with the warm and cool color content of the subject and shown as dotted areas of layer 84, to migrate in the form of a complex silver salt through the processing liquid and through layer 32 to the silverrecep re laye. 94 wherein said complex silver salt is reduced to silver and is represented by dotted portions 94:: and E 1). The water-soluble red dye of sections migrates through the processing liquid substantially without change of pattern to portion 92a of dye-substantive layer 92, the water insoluble green dye of sections 88 being retained said sections 88 of the emulsion and thus providing clear or uncolored striped portions 92!; of the dye-substantive layer which are interspersed with the red-dyed stripes 9.2a. Upon completion of the processing period, film element '75, including a layer of hardened processing liquid 1%, is stripped from the print receiving element.

A fragmentary section 162 f the print which has been thus stripped from the film element and separated along semi-pertorations $84! from the container-carrying portion or the print-receiving element is shown in FIG. 12. Image portions representing the warm colors of the subiect are superposed with the red-dye stripes 2a of layer 92 while image portions 9411 representing the cool colors of the subject are superposed with the uncolored stripes 921). Base 96* is transparent or opaque as determined by intended use of the print as a transparency or as a reflection print. in either instance the print produces a multicolored eiiect by the additive synthesis of the red-colored positive image portions or increments and it) the uncolored positive image portions or increments. The dye-substantive layer or stratum 5 2 is needed only if the silver-receptive layer is not substantive to the dye. if layer 92 is omitted, both the image portions and the dye would be included in layer 94, the print closely resembling that of FIG. 6.

In FiG. 13 a construction is shown wherein both the photosensitive film element and the print-receiving element are supplied as an integral unit The unit 164, only a fragment of which is illustrated, comprises a transparent base tee, a transparent silver-receptive layer or stratum tea, a transparent water-permeable screen 11%), and a panchromatic emulsion layer 1112. Screen 116 is divided into two groups of interspersed filter sections 114 and 116, sections 114 being in the form of relatively broad red-dyed stripes and sections 116 being in the form of relatively narrow stripes which are undyed and optically clear. Emulsion 112 also comprises two groups of interspersed sections 113 and 12% sections 118 being in the form of relatively broad undyed and optically clear stripes and sections 120 being in the form of relatively narrow green-dyed stripes. It will be noted that the clear stripes 118 of the emulsion are aligned with the red-dyed filter stripes 114 and that the greendyed stripes 12.0 of the emulsion are aligned with the clear 5. ter stripes 116. A liquid processing unit 122, also shown as a fragmentary section and comprising a barrier sheet 12 3- upon which is mounted a collapsible containcr 126 releasably holding a processing liquid 128, is illustrated in contiguous facing relation with the unit 1%, a condition such as would exist in the processing chamber of a camera (not shown) of a type hereinbefore described.

Emulsion 112 is exposed in the direction indicated by the arrow 113 through base res, silver-receptive layer 38, and screen ill to provide in emulsion stripes 118 latent image portions of the warm color content of the subject and in emulsion stripes 124i latent image portions of the cool color content of the subject. Unexposed and partially exposed portions within emulsion 112 are indicated by dots. inasmuch as exposure occurs through base 1%, it will be apparent that units Mid and 122 could be supplied as an integral unit without interfering with said exposure. When the processing liquid is released and spread between barrier sheet 124 and emulsion 112, as shown in Flu. 14, silver halide eveloper and solvent in aqueous solution permeate emulsion E12, screen ill and silver-receptive layer 1%, reduce exposed silver halide to silver and cause unreduced silver halide identified with the warm and cool colors of the subject to migrate in the form of a complex silver salt through screen 110, and at least to the surface of layer i138 whereon or Wherewithin it is reduced to silver as represented by dotted portions 163a and l t-db. When barrier sheet 124 is removed, emulsion 112 is caused to adhere thereto by the film 128 of hardened processing liquid. The print, composed of screen lllll having reddyed stripes 114 and interspersed clear stripes 116, print-carrying layer 1% and base 1%, is removed from non-irnage-carrying portions along semiperforations illua. it is similar to the print shown in FIG. 12 and, though containing only a red dye, appears to be multicolored. Base res may be treated to provide a reflecting surface if a reflection print is desired.

While the prints illustrated in H68. 3, 6, 9 and 12 have been described especially in coniunction with a method of photography involving difiusion transfer reversal of image-forming components, it is to be understood that prints or" a generally similar type can be produced by a modified method. Thus, for example, in a modification of the structure of HQ. 12, screen 92 could consist of interspersed red-dyed stripes 92a and green-dyed stripes 92b, the green dye being Water soluble and the red dye being water insoluble. Layer 94 could be a panchromatic silver halide gelatin emulsion. This emulsion, when photographically exposed through stripes 92a and 92b of screen 92 becomes divided into latent image portions identified with the warm and cool colors, respectively, of the photographic subject, i.e., the predominantly red and green colors. After the photographic exposure, the unit is subjected to any suitable reversal process which converts the latent image portions in situ to black-andwhite positive image portions or increments recording, in terms of silver density, the distribution of said warm and cool colors. The green dye dissolves during processing to convert stripes 92b to an uncolored or clear status, the red dye of stripes 92 being unaffected. The unit would, accordingly, function in a manner identical to that of the print of FIG. 12 and would appear to be multicolored.

in a modification of the structure of FIG. 6, layer 42 could be composed of an orthochromatic silver halide gelatin emulsion divided into stripes 42a which are treated with a red sensitizer and colored with a red dye, and stripes 42b which are neither specially sensitized nor colored. When photographically exposed through a pale yellow filter, latent image portions identified with the warm colors of the photographic subject are formed in stripes 42a and latent image portions identified with the cool colors of the photographic subject are formed in stripes 42b. Thereafter, positive image portions are formed in situ from the latent image portions as blackand-white densities by any suitable reversal process, the print appearing multicolored in a manner identical with that of the print in FIG. 6.

Although the screen sections have been illustrated as interspersed stripes and this construction constitutes a preferred embodiment of the invention from a manufacturing viewpoint, other geometric patterns as well as an irregular mosaic may be employed with entirely satisfac tory results. In employing any other form of screen configurations the usual considerations as to size would, of course, apply, it being required that they be suficiently small to prevent their resolution by the human eye and sufficiently large to permit the formation of suitable image densities of the type described. It will be understood that to obtain the desired latent negative images in emulsion means of the invention it is not entirely necessary to include a color in the taking screen which is similar to a color of the subject or of the viewing screen. Thus, for example, it would be possible to have a geometric pattern such as interspersed stripes of an emulsion sensitive essentially only to the red and containing sensitizer which absorbs in the red and an uncolored orthochromatic emulsion constituting the taking screen, said stripes being optically aligned with a geometric pattern of red and uncolored stripes, respectively, of the vie-wing screen.

Wherein a dye is embodied in an emulsion of the foregoing constructions, the dye is chosen so as not to appre- "ciably affect the sensitivity of the emulsion. Although emulsion layers have been Shown in the illustrations as including dye to their full depth, preferably the depth of penetration of the dye in the emulsion is limited to minimize the possibility of its affecting the emulsions sensitivity and to reduce any sidewise diffusion of the dye during its transfer to a layer of the print. The depth of penetration of the dye in the emulsion is lessened, for example, when the dye is applied in a paste rather than in a dilute solution, the latter tending to completely wet the emulsion. Permeation of the dye into the emulsion is also lessened when the dye is included in an organic solvent which is incompatible with gelatin. Selective solubility of red and green dyes of the emulsion or screen in the processing liquid may be controlled by the use of a mordant or mordants. Thus, for example, if stripes 92a of FIG. 11 have been treated with a mordant for the red dye and stripes 88 with a mordant for the green dye, during the processing operation the red dye will be released from stripes 86 for transfer to stripes 92a where it will become insoluble, and the green dye will be retained by stripes ti. Suitable red dyeshave been prepared .12 from a mixture of Fast Fuschine G (Cl. 29) and Tartrazine or from a mixture of l,5-dihydroxy-naphthalenel' az-o-benzene and benzene azo resorcinol. Suitable green dyes have been prepared from a mixture of Tartrazine and Alpha Zurine 28 (Cl. 712) or from a mixture of benzene azo resorcinol (Cl. 23) and losol Blue.

Although the migrant color-providing substance employed in certain of the difiusion transfer reversal examples of the present invention has invariably been stated to be a dye, it will be understood that where said substance is not required to serve as a filter during the photographic exposure, it could be of an initially colorless type such as one comprising color couplers and. the color could be produced in the print by oxidation adjacent the site of the positive image, an oxidizing agent being included in a layer of the image-receiving element or in the processing liquid for the purpose. In such an instance an individual screen would be included for filtering purposes during the photographic exposure.

Since certain changes may be made in the above product and process without departing from the scope of the invention herein involved, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. A photographic process for forming a screen-type image exhibiting a plurality of colors, comprising the steps of selectively and concurrently exposing to a photographic subject spaced minute screen areas of a first predeterminedly sensitized silver halide emulsion layer and minute screen areas of a second colored silver halide emulsion layer superimposed with spaced areas of the first emulsion layer intervening between said minute screen areas thereof, the second emulsion layer being sensitized to a portion of the visible spectrum which is different from that of said first emulsion layer, said areas of one layer thus being generally offset relative to those of the other in the planes of the layers so as to permit substantially unobstructed exposure of the respective screen areas, said second emulsion layer being positioned nearest the photographic subject during the exposure and containing a red dye which serves a color separation function during said exposure, the dye being of a type adapted to transfer continuously to an image-receiving layer superimposed with said emulsion layers when in solution, and applying a processing liquid to said emulsion layers, said liquid when imbibed into said emulsion layers comprising a silver halide developer, a silver halide solvent and a solvent for said dye, and when thus imbibed acting to develop the latent images formed in said emulsion layers during their photographic exposure, to react with unreduced silver halide and form an imagewise distribution of soluble silver complex therein and to cause the imagewise transfer of soluble silver complex image-forming components and continuous transfer of dye to said imagereceiving layer to provide said screen-type image, there occurring a transfer of both dye and silver complex to the image-receiving layer only at areas of said layer generally corresponding to those screen areas of an emulsion layer which contain the red dye so that there is formed in each of such areas of the image-receiving layer a'continuous essentially uniform distribution of red dye and an imagewise distribution of silver, while in the other areas of the image-receiving layer there is formed merely an imagewise distribution of silver.

2. A photographic process, as defined in claim 1, wherein said first layer is an orthochromatic emulsion and said second layer is a panchormatic emulsion overlaid in the form of a screen, on said first layer.

3. A photographic process, as defined in claim 1, wherein said image-receiving layer is stripped from said layers after transfer of said image-forming components and dye to said surface.

4. A photographic process, as defined in claim 1, wherein said processing liquid contains a film-forming ingredient and the screen-type image is formed in the film provided by said ingredient, the film then being solidified to provide a permanent carrier for the image.

5. A photographic process, as defined in claim 1, wherein said image-receiving layer is provided separately from, and brought to a position adjacent to, the emulsion layers.

6. A photographic process for forming by diffusion transfer on an image-receiving layer a screen print exhibiting a plurality of colors, comprising the steps of exposing to a photographic subject two sets of difierentially hued screen areas of a photosensitive silver halide emulsion layer, one of the hues being provided by a substance which is nondiflusible in a processing liquid and the other being provided by a dye which is continuously diffusible therein, applying a processing liquid comprising a silver halide developer, a silver halide solvent and a solvent for said diffusible dye to the internal surfaces of said layers, the liquid being imbibed into at least said emulsion layer to develop the latent images formed therein during the photographic exposure, to react with unreduced silver halide and to cause an imagewise transfer of soluble silver complex image-forming components from both said sets of screen areas, together with a continuous transfer of said diifusible dye from one set of screen areas, only, to said image-receiving layer superimposed with said emulsion layer, there occurring a transfer of both dye and silver complex to the image-receiving layer substantially exclusively at areas of said layer generally corresponding to those screen areas of said emulsion layer which contain said dillusible dye so that there is formed in each of said areas of the image-receiving layer a continuous essentially uniform distribution of dye and an imagewise distribution of silver, while in the other areas of the image-receiving layer there is formed substantially an imagewise distribution of silver, only.

7. A photographic process, as defined in claim 6, wherein said image-receiving layer is held in superimposed fixed relation with said emulsion layer during at least the spreadand imbibition of said processing liquid.

8. A photographic process, as defined in claim 6, wherein said image-receiving layer, upon or within which the print is to be carried, is formed by solidifying a film-forming ingredient of said processing liquid.

9. A photographic process, as defined in claim 6, wherein said differentially hued screen areas are geometric regular screen areas.

10. A photographic process for forming by diffusion transfer on an image-receiving layer a screen print exhibiting a plurality of colors comprising the steps of exposing to a photographic subject two sets of dififerently sensitized screen areas of a photosensitive silver halide emulsion, one of said sets of difierently sensitized screen areas being sensitive predominantly to the green and the other of said sets being sensitive predominantly to the red content of said photographic subject, said last-named set of screen areas being provided with a red dye which is continuously difinsible. processing said photosensitive silver halide emulsion, while the latter is in superposed relation to an imagereceiving sheet, with a silver halide developer, a silver halide solvent and a solvent for said red dye to develop the latent images formed therein during the photographic exposure, to react with the unreduced silver halide and to cause an imagewise transfer of a soluble silver complex, there occurring a transfer of both dye and silver complex to the image-receiving sheet only in areas of the latter generally corresponding to those screen areas of the emulsion which contain the red dye so that there is formed in such areas of the image-receiving sheet a continuous essentially uniform distribution of red dye and an imagewise distribution of silver, while in the other areas of the image-receiving sheet there is formed an imagewise distribution of silver.

11. As a new article of manufacture, a composite photographic film product for providing a positive screen-type image exhibiting a plurality of colors on a prepared surface thereof when subjected to photographic exposure and processing, said product comprising a base layer, a first continuous silver halide emulsion layer bonded to said base layer sensitized to a predetermined band of the visible spectrum, a second silver halide emulsion layer sensitized to a different band of the visible spectrum in the form of a plurality of screen elements containing a continuously difiusible dye bonded to said first emulsion layer and etermining the areas of said first emulsion layer which are unobstructed and permitted to contribute through an imagewise transfer of image-forming components to the formation of said screen-type image, said areas being those uncovered by the screen elements of the second layer, a sheet material, a collapsible liquid container mounted between said second emulsion layer and said sheet material and releasably containing a processing liquid including a silver halide developer, a silver halide solvent and a solvent for said dye, said processing liquid being held for release and spreading between said second layer and sheet material and for imbibition into at least said emulsion layers after said exposure, said liquid being adapted to develop latent negative images of said photographic exposure in said first and second emulsion layers, to provide substantially unreduced, soluble silver complex therein, and to transfer said dye and image-forming components composed of said complex selectively to said prepared surfaces for forming said positive screen-type image.

12. A film product, as defined in claim 11, wherein said first emulsion layer is orthochromatic and said second emulsion layer is panchromatic.

13. As a new article of manufacture, a composite photographic film product for providing a positive screen-type image exhibiting a plurality of colors formed on a prepared sur ace thereof when subjected to photographic exposure and processing, said product comprising a base layer, at least one photosensitive silver halide emulsion layer, a plurality of filter elements comprising dyes of two different colors representative of the Warm and cool color content of a photographic subject arranged in a screen pattern adjacent and substantially coextensive with said emulsion layer, a sheet material, a collapsible container mounted between said sheet material and said emulsion layer and containing a processing liquid adapted, after the photographic exposure of said emulsion, to be released from said container under externally applied pressure, to be spread between said sheet material and emulsion layer and to permeate at least said emulsion layer, said processing liquid comprising a silver halide developer, a silver halide solvent and a solvent for the dye of one of said colors, only, said processing liquid being adapted to develop a latent negative image of said photographic exposure in said emulsion layer, to react with unreduced silver halide and provide an imagewise distribution of soluble silver complex therein. and to transfer said complex imagewise and said soluble dye of one of said colors continuously to said prepared surface for forming said positive screen-type image, the dye of the other color being adapted to be retained at its location adjacent said emulsion layer.

14. A composite photographic film product, as defined in claim 13, wherein said filter elements of at least one of said colors are incorporated with said emulsion layer.

15. A composite photographic film product, as defined in claim 13, wherein said filter elements of at least one of said colors are incorporated in a separate transparent layer coextensive and contiguous with said emulsion layer.

16. A composite photographic film product, as defined in claim 13, wherein the filter elements of one of said colors contain a dye mordant effective to retain the dye in said elements when they are subjected to said processing liquid, whereas the filter elements of the other of said colors are devoid of said mordant and are adapted to he transferred to said prepared surface in response to said liquid.

"References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS 656,909 Great Britain Sept. 5, 1951 OTHER REFERENCES Wall: The History of Three Color Photography, AM. Photo. Publishing Co, Boston 1925, pages 596 and 597.

WUQSUIET 18, 1896 Cornwell-Clyne: Colour Cinematography, Chapman Rhemberg 23, 1915 and Hall, London, 1951, pages 261, 262 and 265-268.

I- 1952 10 Neblette: Photography, Its Materials and Processes, 5th Land P 1955 ed, D. Van Nostrand (30., IDQ, New York, 1952, page 400. 

1. A PHOTOGRAPHIC PROCESS FOR FORMING A SCREEN-TYPE IMAGE EXHIBITING A PLURALITY OF COLORS, COMPRISING THE STEPS OF SELECTIVELY AND CONCURRENTLY EXPOSING TO A PHOTOGRAPHIC SUBJECT SPACED MINUTE SCREEN AREAS OF A FIRST PREDETERMINEDLY DENSITIZED SILVER HALIDE EMULSION LAYER AND MINUTE SCREEN AREAS OF A SECOND COLORED SILVER HALIDE EMULSION LAYER SUPERIMPOSED WITH SPACED AREAS OF THE FIRST EMULSION LAYER INTERVENING BETWEEN SAID MINUTE SCREEN AREAS THEREOF, THE SECOND EMULSION LAYER BEING SENSITIZED TO A PORTION OF THE BISIBLE SPECTRUM WHICH IS DIFFERENT FROM THAT OF SAID FIRST EMULSION LAYER, SAID AREAS OF ONE LAYER THUS BEING GENERALLY OFFSET RELATIVE TO THOSE OF THE OTHER IN THE PLANES OF THE LAYERS SO AS TO PERMIT SUBSTANTIALLY UNOBSTRUCTED EXPOSURE OF THE RESPECTIVE SCREEN AREAS, SAID SECOND EMULSION LAYER BEING POSITIONED NEAREST THE PHOTOGRAPHIC SUBJECT DURING THE EXPOSURE AND CONTAINING A RED DYE WHICH SERVES A COLOR SEPARATION FUNCTION DURING SAID EXPOSURE, THE DYE BEING OF A TYPE ADAPTED TO TRANSFER CONTINUOUSLY TO AN IMAGE-RECEIVING LAYER SUPERIMPOSED WITH SAID EMULSION LAYERS WHEN IN SOLUTION, AND APPLYING A PROCESSING LIQUID TO SAID EMULSION LAYERS, SAID LIQUID WHEN IMBIDED INTO SAID EMULSION LAYERS, COMPRISING A SILVER HALIDE DEVELOPER, A SILVER HALIDE SOLVENT AND A SOLVENT FOR SAID DYE, AND WHEN THUS IMBIDED ACTING TO DEVELOP THE LATENT IMAGES FORMED IN SAID EMULSION LAYERS DURING THEIR PHOTOGRAPHIC EXPOSURE, TO REACT WITH UNREDUCED SILVER HALIDE AND FROM AN IMAGEWISE DISTRIBUTION OF SOLUBLE SILVER COMPLEX THEREIN AND TO CAUSE THE IMAGEWISE TRANSFER OF SOLUBLE SILVER COMPLEX IMAGE-FORMING COMPONENTS AND CONTINOUOUS TRANSFER OF DYE TO SAID IMAGERECEIVING LAYER TO PROVIDE SAID SCREEN-TYPE IMAGE, THERE OCCURRING A TRANSFER OF BOTH DYE AND SILVER COMPLEX TO THE IMAGE-RECEIVING LAYER ONLY AT AREAS OF SAID LAYER GENERALLY CORRESPONDING TO THOSE SCREEN AREAS OF AN EMULSION LAYER WHICH CONTAIN THE RED DYE SO THAT THERE IS FORMED IN EACH OF SUCH AREAS OF TH IMAGE-RECEIVING LAYER A CONTINUOUS ESSENTIALLY UNIFORM DISTRIBUTION OF RED DYE AND AN IMAGEWISE DISTRIBUTION OF SILVER, WHILE IN THE OTHER AREAS OF THE IMAGE-RECEIVING LAYER THERE IS FORMED MERELY AN IMAGEWISE DISTRIBUTION OF SILVER. 